Base.php

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<?php
namespace Magento\Framework\App\Config;

class Base extends \Magento\Framework\Simplexml\Config
{
    public static $instances = [];

    public function __construct($sourceData = null)
    {
        $this->_elementClass = \Magento\Framework\App\Config\Element::class;
        parent::__construct($sourceData);
        self::$instances[] = $this;
    }

    public static function destroy()
    {
        if (is_array(self::$instances)) {
            foreach (self::$instances as $instance) {
                $instance->_xml = null;
            }
        }
        self::$instances = [];
    }
}